Largest radiology and imaging groups in the US
- Groups
- 2,687
- Radiology groups
- 2,677
- Nuclear Medicine groups
- 10
- Radiology specialists
- 31,987
- Nuclear medicine specialists
- 10
There are 2,687 radiology and imaging groups in the US with a Medicare PAC ID: 2,677 radiology and 10 nuclear medicine. Singleton Associates PA is the largest radiology group, with 1,500 radiology specialists, and Nuclear Medicine Associates the largest nuclear medicine group, with 3 nuclear medicine specialists.
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Singleton Associates PA is the largest radiology group in the US, with 1,500 radiology specialists
Ranked by radiology specialists linked to each group whose main sub-specialty is radiology. MBB Radiology is second with 1,381, and Sonoran Radiology third with 853.
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
Nuclear Medicine Associates is the largest nuclear medicine group in the US, with 3 nuclear medicine specialists
Ranked by nuclear medicine specialists linked to each group whose main sub-specialty is nuclear medicine. Pet Diagnostic Imaging, Corp. is second with 1, and Monserrate Imaging Center third with 1.
Sources: Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Affiliation Data
California has the most radiology and imaging groups, with 266
Florida is second with 204 and New York third with 194. Every state with 5 or more groups has its own list.
- California266
- Florida204
- New York194
- Texas146
- New Jersey106
- Georgia94
- Illinois90
- Pennsylvania89
- Puerto Rico86
- Michigan80
- Louisiana66
- Ohio64
- Virginia61
- Tennessee60
- North Carolina59
- Arizona58
- Washington57
- Alabama56
- Indiana48
- Massachusetts48
- Oklahoma44
- Maryland43
- Connecticut41
- Minnesota41
- Oregon38
- Missouri36
- Wisconsin33
- Colorado31
- Montana31
- Mississippi30
- Kentucky26
- Arkansas25
- Iowa24
- Idaho24
- Kansas24
- Nevada24
- South Carolina24
- New Mexico22
- Alaska20
- Utah20
- Wyoming20
- Nebraska18
- North Dakota15
- New Hampshire15
- Maine14
- Hawaii13
- South Dakota12
- West Virginia12
- Delaware10
- Rhode Island9
- Guam5
- Vermont5
- Washington, DC3
- U.S. Virgin Islands2
Source: Doctors and Clinicians National Downloadable File (CMS)
Radiology Partners has the most physicians in US radiology and imaging groups, with 5,851 across 48 groups
235 parent organizations have two or more US radiology and imaging groups. Among health systems, Adventist Health has the most groups, 14. Each clinician counts once per parent organization.
See every medical group, site and clinician under Radiology Partners
Org Hierarchy Explorer maps every group, site of care and clinician under the parent, with the leaders at each group.
Source: Dmand AI Org Hierarchy Data
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Dmand AI maps the owners, administrators and physician leaders at each of the 2,687 US radiology and imaging groups, with the parent organization above each one, and finds validated work emails and mobile numbers.
37% of US radiology and imaging groups are independent, with no larger parent organization
A group counts as independent when no health system, platform or other organization sits above it in the org hierarchy. Every other group belongs to a larger organization.
US radiology and imaging groups by ownership
- Independent1,007
- Health system or hospital694
- Platform or corporate owner252
- Community or government126
- Other organization608
Sites of care beyond their own offices
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Dmand AI maps each group to the health system, physician platform or management company above it, so you can sell to the owner, not one site.
Source: Dmand AI Org Hierarchy Data
Each US radiology and imaging group profile shows the parent, sites, clinicians and identifiers
- Clinicians and specialtiesA count by specialty and a sample of the group's cliniciansOn every profile
- Practice locationsMain site and a sample of practice locations, with a count of the restOn every profile
- Medicare Part B paymentsMedicare payments to the group, from CMSOn every profile
- Group NPI and Medicare PAC IDIdentifiers for matching records across sourcesOn every profile
- Parent organizationThe health system, platform or owner above the groupOn every profile
- Every clinician and siteThe full roster and every practice locationWith a free account
- Leader and clinician contactsWork emails and mobile numbers, found on request and then validatedWith a free account
- EHR used by the group's cliniciansThe EHR in use at the group's sitesWith a free account
Free account: 30 days free, self-serve, no credit card.
Sources: Doctors and Clinicians National Downloadable File (CMS), Medicare Physician & Other Practitioners (CMS) and Dmand AI Org Hierarchy Data
Sources for the US radiology and imaging group list
| Data on this page | Source |
|---|---|
| Medical groups, specialties and sites | Doctors and Clinicians National Downloadable File (CMS) and Dmand AI Professional Profile Data |
| Parent organizations and independence | Dmand AI Org Hierarchy Data |
| Physicians and HCPs | Dmand AI Affiliation Data |
| Group NPI and PAC ID | NPPES NPI Registry (CMS) and Doctors and Clinicians National Downloadable File (CMS) |
Data last refreshed October 2026Report an inaccuracyRemove my information
Groups whose main specialty is radiology and imaging and that have a Medicare PAC ID.
FAQ
Frequently asked questions about US radiology and imaging groups
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is the largest radiology group in the US?
Singleton Associates PA, based in Shenandoah, Texas, with 1,500 radiology specialists and 1,643 HCPs. MBB Radiology is second with 1,381.
What is the largest nuclear medicine group in the US?
Nuclear Medicine Associates, based in Redding, California, with 3 nuclear medicine specialists and 4 HCPs. Pet Diagnostic Imaging, Corp. is second with 1.
How many radiology and imaging groups are in the US?
There are 2,687 radiology and imaging groups in the US with a Medicare PAC ID: 2,677 radiology and 10 nuclear medicine. Between them they have 31,987 radiology specialists and 10 nuclear medicine specialists.
Which state has the most radiology and imaging groups?
California, with 266, followed by Florida with 204 and New York with 194.
Which companies own the most radiology and imaging groups?
By physicians, Radiology Partners, with 5,851 across 48 groups, followed by RadNet with 2,011 and Fonar with 45.
How many radiology and imaging groups are independent?
1,007, or 37%, have no larger parent organization in the Dmand AI org hierarchy. 694 belong to a health system or hospital and 252 to a physician platform or corporate owner.
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